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  • The simplest demonstrations of quantum nonlocality

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    Author(s)
    Saunders, Dylan J
    Palsson, Matthew S
    Pryde, Geoff J
    Scott, Andrew J
    Barnett, Stephen M
    Wiseman, Howard M
    Griffith University Author(s)
    Wiseman, Howard M.
    Pryde, Geoff
    Year published
    2012
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    Abstract
    We investigate the complexity cost of demonstrating the key types of nonclassical correlations-Bell inequality violation, Einstein, Podolsky, Rosen (EPR)-steering, and entanglement-with independent agents, theoretically and in a photonic experiment. We show that the complexity cost exhibits a hierarchy among these three tasks, mirroring the recently discovered hierarchy for how robust they are to noise. For Bell inequality violations, the simplest test is the well-known Clauser-Horne-Shimony-Holt test, but for EPR-steering and entanglement the tests that involve the fewest number of detection patterns require nonprojective ...
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    We investigate the complexity cost of demonstrating the key types of nonclassical correlations-Bell inequality violation, Einstein, Podolsky, Rosen (EPR)-steering, and entanglement-with independent agents, theoretically and in a photonic experiment. We show that the complexity cost exhibits a hierarchy among these three tasks, mirroring the recently discovered hierarchy for how robust they are to noise. For Bell inequality violations, the simplest test is the well-known Clauser-Horne-Shimony-Holt test, but for EPR-steering and entanglement the tests that involve the fewest number of detection patterns require nonprojective measurements. The simplest EPR-steering test requires a choice of projective measurement for one agent and a single nonprojective measurement for the other, while the simplest entanglement test uses just a single nonprojective measurement for each agent. In both of these cases, we derive our inequalities using the concept of circular two-designs. This leads to the interesting feature that in our photonic demonstrations, the correlation of interest is independent of the angle between the linear polarizers used by the two parties, which thus require no alignment.
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    Journal Title
    New Journal of Physics
    Volume
    14
    DOI
    https://doi.org/10.1088/1367-2630/14/11/113020
    Copyright Statement
    © 2012 Institute of Physics Publishing. The attached file is reproduced here in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
    Note
    Page numbers are not for citation purposes. Instead, this article has the unique article number of 113020.
    Subject
    Physical sciences
    Quantum information, computation and communication
    Quantum optics and quantum optomechanics
    Publication URI
    http://hdl.handle.net/10072/51331
    Collection
    • Journal articles

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